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Analog Devices Inc. LTC1044CJ8
- Part No.:
- LTC1044CJ8
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LTC1044CJ8.pdf
- Description:
- IC REG 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,235
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Product details
Overview
LTC1044CJ8 from Analog Devices is a monolithic CMOS switched-capacitor voltage converter in an 8-lead CERDIP package, supporting input inversion (VOUT = –VIN), doubling (VOUT = 2VIN), division (VOUT = VIN/2), and multiplication (VOUT = ±nVIN) without external diodes across 1.5V–9V supply range. It operates from –40°C to +85°C and delivers ≤200µA no-load supply current at 5V with ≥97% open-circuit voltage conversion efficiency.
For engineers reviewing the LTC1044CJ8 datasheet, LTC1044CJ8 pinout, LTC1044CJ8 application, or LTC1044CJ8 equivalent, this device serves as a drop-in upgrade to the 7660 for battery-powered instrumentation, precision analog signal conditioning, and dual-rail generation where low quiescent current, wide supply range, and boost-enabled frequency tuning are critical selection criteria.
Technical Context
The LTC1044CJ8 integrates an internal oscillator with user-controllable frequency via BOOST (Pin 1) and OSC (Pin 7), enabling up to ~7× frequency increase when BOOST is tied to V+. Its LV (Pin 6) logic rail is internally shorted to GND for V+ ≥ 3V, eliminating external biasing in most applications.
Switching architecture uses charge-transfer through external capacitors C1 and C2 to realize voltage conversion functions. Output impedance is dominated by 1/(f·C1) at lower frequencies and switch on-resistance at higher frequencies, with typical 80Ω output resistance at 5kHz and 5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.5V to 9V - supports single-cell alkaline, mercury, or NiCd batteries without external protection diodes. |
| No-Load Supply Current | ≤200 µA at 5V - enables multi-year operation in low-power portable instrumentation. |
| Voltage Conversion Efficiency | ≥97% at open circuit - minimizes energy loss during polarity inversion or division for precision references. |
| Power Conversion Efficiency | ≥95% at RL = 5kΩ - sustains high efficiency under moderate load conditions typical of op-amp biasing. |
| Oscillator Frequency Range | 1 kHz to 10 kHz (adjustable via BOOST pin and COSC) - allows trade-off between output ripple (lower f) and output impedance (higher f). |
| Output Resistance | 80 Ω typical at 5V/5kHz - defines load regulation capability for driving 10–15 mA analog circuits. |
| Operating Temperature | –40°C to +85°C - qualified for commercial-grade industrial and automotive cabin electronics. |
Pinout & Package
Package: 8-Lead CERDIP (hermetic ceramic dual in-line package), narrow body (.300" width), with full lead option per drawing LTC DWG #05-08-1110.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BOOST) | Oscillator frequency control input | Tying to V+ increases internal oscillator frequency ~7×, reducing output impedance and ripple for higher load currents. |
| 2 (OSC) | Oscillator timing node | Connects to external capacitor (COSC) to set base frequency; can be driven externally with CMOS/TTL logic. |
| 3 (GROUND) | Reference ground terminal | Common return for V+, CAP–, and output reference; must be low-impedance for stable voltage conversion. |
| 4 (CAP–) | Negative flying capacitor terminal | Connects to negative plate of flying capacitor C1; forms charge transfer path during switching phase. |
| 5 (VOUT) | Converted output voltage terminal | Delivers inverted, doubled, halved, or multiplied output; exhibits 80Ω effective series resistance at 5kHz. |
| 6 (LV) | Logic voltage reference | Internally shorted to GND when V+ ≥ 3V; must be externally grounded only for V+ < 3V to ensure start-up. |
| 7 (CAP+) | Positive flying capacitor terminal | Connects to positive plate of flying capacitor C1; alternates charge/discharge with CAP– to enable voltage conversion. |
| 8 (V+) | Positive supply input | Accepts 1.5V–9V unregulated input; powers internal CMOS logic and switching transistors directly. |
Key Features
| Feature | Design Value |
|---|---|
| Pin-for-pin compatibility with ICL7660 | Enables direct replacement in legacy 7660 designs without PCB changes or layout modification. |
| Boost-enabled oscillator scaling | Increases switching frequency up to ~7× to reduce output impedance and improve transient response under load. |
| No external diode required up to 9V | Eliminates BOM cost and board space for protection diodes across full temperature range (–40°C to +85°C). |
| Precision voltage division (±20 ppm) | Supports ultra-stable reference splitting (e.g., V+/2) for ratiometric ADC systems requiring sub-0.002% accuracy. |
| Low quiescent current (≤200 µA) | Extends battery life in portable medical sensors, handheld meters, and remote data loggers. |
Applications
| Portable Instrumentation Power | Precision Analog Signal Conditioning |
|---|---|
|
Use Scenario: Generating ±5V rails from a single 9V alkaline battery in handheld multimeters and portable oscilloscopes. IC Role / Device Role / Timing Role: Voltage splitter and inverter providing symmetrical dual supplies referenced to common ground. Use Value: Eliminates need for discrete regulators or transformers, achieving >95% power efficiency and <100mV load regulation over 0–10mA. |
Use Scenario: Biasing low-noise op-amps (e.g., LT1013) in strain gauge bridge amplifiers requiring matched ±VREF. IC Role / Device Role / Timing Role: Precision voltage divider delivering V+/2 ±20ppm for ratiometric A/D conversion. Use Value: Enables 0.002% accuracy in pressure transducer outputs without laser-trimmed resistors or external references. |
| Battery-Powered Sensor Nodes | Legacy 7660 System Upgrades |
|
Use Scenario: Powering low-current analog front-ends (e.g., LM10-based sensor interfaces) from two 1.2V NiCd cells in wireless sensor tags. IC Role / Device Role / Timing Role: Efficient voltage doubler converting 2.4V input to stable 4.8V logic supply. Use Value: Operates down to 1.5V supply with ≤200µA quiescent current, extending operational life beyond 5 years on primary cells. |
Use Scenario: Replacing obsolete ICL7660 in existing PCBs for improved reliability and extended voltage range. IC Role / Device Role / Timing Role: Drop-in functional replacement maintaining identical pinout and external component values. Use Value: Adds BOOST functionality and eliminates external diodes while preserving all legacy design margins and test fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switched-capacitor voltage converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICL7660CPA | Higher quiescent current (1.2mA typ), requires external diode above 6.5V, no BOOST pin, narrower 1.5V–6V supply range. | Limited to low-frequency, low-efficiency applications where diode overhead is acceptable and supply stays below 6.5V. | Select only if legacy footprint reuse is mandatory and performance requirements are minimal. |
| MAX1044CPA | Same pinout and function, but specifies 1.4V minimum supply and includes internal oscillator trimming; no BOOST pin. | Suitable for ultra-low-voltage start-up (e.g., coin-cell powered devices), but lacks frequency tuning for dynamic load optimization. | Prefer when operating below 1.5V is required, but avoid when adjustable output impedance or ripple reduction is needed. |
Compared with ICL7660CPA and MAX1044CPA, the LTC1044CJ8 uniquely combines 9V operation without diodes, BOOST-enabled frequency scaling, and 200µA quiescent current-making it optimal for battery-constrained, high-accuracy dual-rail systems where design flexibility and long service life are prioritized.
Availability
LTC1044CJ8 is available at Aetrix Electronics and suitable for portable instrumentation power, precision analog signal conditioning, battery-powered sensor nodes, and legacy 7660 system upgrades requiring stable component supply across extended lifecycle windows.
Supply support for LTC1044CJ8 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The LTC1044CJ8 belongs to Analog Devices' legacy Linear Technology switched-capacitor converter product line, designed specifically for low-power, high-accuracy DC-DC voltage transformation in space- and energy-constrained analog systems.
FAQ
What is the maximum supply voltage supported by the LTC1044CJ8?
The LTC1044CJ8 supports a maximum supply voltage of 9V across its full operating temperature range (–40°C to +85°C) without requiring external protection diodes. This is confirmed in the Absolute Maximum Ratings table and reinforced by application notes stating guaranteed operation up to 9V with no external diode, even with alkaline or mercury batteries whose initial voltage may slightly exceed 9V.
Does the LTC1044CJ8 require external diodes for operation above 6.5V?
No, the LTC1044CJ8 does not require external diodes for operation up to 9V. Its enhanced LTCMOS™ process and internal circuit design eliminate the need for external protection diodes across the entire 1.5V–9V supply range and –40°C to +85°C temperature range, unlike earlier 7660 variants which mandated diodes above 6.5V.
How does the BOOST pin (Pin 1) affect LTC1044CJ8 performance?
Tying the BOOST pin (Pin 1) to V+ increases the internal oscillator frequency by approximately seven times, which lowers output impedance and reduces voltage ripple-especially beneficial under higher load currents. This feature is unique to the LTC1044CJ8 and not present in the ICL7660 or MAX1044, enabling dynamic optimization of efficiency versus regulation.
What is the guaranteed operating temperature range for the LTC1044CJ8?
The LTC1044CJ8 is guaranteed to operate from –40°C to +85°C, as specified in the Ordering Information table under "LTC1044CJ8#PBF" and "LTC1044CJ8#TRPBF", and confirmed in the Electrical Characteristics section where parameters marked with "l" apply over this full temperature range.
Can the LTC1044CJ8 be used as a direct replacement for the ICL7660?
Yes, the LTC1044CJ8 is explicitly designed as a pin-for-pin and functionally compatible replacement for the ICL7660, with identical pinout, same external capacitor requirements, and backward-compatible operation. It adds enhancements-including BOOST functionality, wider supply range, and lower quiescent current-without altering legacy PCB layouts or bill-of-materials.
LTC1044CJ8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LTC1044CJ8 FAQ
1.How can I place an order for LTC1044CJ8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1044CJ8 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1044CJ8 reliable?
The price and inventory of LTC1044CJ8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1044CJ8 is usually 5 days.
3.What payment methods are accepted for LTC1044CJ8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1044CJ8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1044CJ8?
LTC1044CJ8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1044CJ8 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1044CJ8?
For technical support, including LTC1044CJ8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1044CJ8 requirements.
6.How does Aetrix verify that LTC1044CJ8 is sourced from the original manufacturer or authorized distributors?
All LTC1044CJ8 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1044CJ8 meets industry standards.
7.What is the process for return or replacement of LTC1044CJ8?
All LTC1044CJ8 units undergo pre-shipment inspection (PSI). If there is an issue with LTC1044CJ8, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1044CJ8 part is unused and in its original packaging.
Return procedure for LTC1044CJ8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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